FILE - In this Tuesday, July 11, 2000 file photo, President Bill Clinton watches as Israeli Prime Minister Ehud Barak, Palestinian leader Yasser Arafat, center, joke with each other about which one goes in the door first, after walking on the grounds of Camp David. The contours of an Israeli-Palestinian peace deal are clear, we are told. If only the two sides would finally summon up the vision, the will and the courage, then the outcome is largely preordained, it is said: Two states roughly along the pre-1967 borders with Jerusalem as a shared capital and some elegant solution for the Palestinian refugees.(AP Photo/Ron Edmonds, File)

FILE - In this Wednesday, Oct. 2, 1996 file photo, Israeli Prime Minister Benjamin Netanyahu, right, looks around PLO leader Yasser Arafat during a news conference at the White House, after President Bill Clinton said that Israeli and Palestinian leaders had failed in a two-day Washington summit to settle their explosive differences. The contours of an Israeli-Palestinian peace deal are clear, we are told. If only the two sides would finally summon up the vision, the will and the courage, then the outcome is largely preordained, it is said: Two states roughly along the pre-1967 borders with Jerusalem as a shared capital and some elegant solution for the Palestinian refugees.(AP Photo/Doug Mills)

FILE - Sept. 28, 1995 file photo shows President Bill Clinton gesturing toward Israeli Prime Minister Yitzhak Rabin, left, and PLO leader Yasser Arafat shaking hands in the East Room of the White House after the Mideast accord signing. The contours of an Israeli-Palestinian peace deal are clear, we are told. If only the two sides would finally summon up the vision, the will and the courage, then the outcome is largely preordained, it is said: Two states roughly along the pre-1967 borders with Jerusalem as a shared capital and some elegant solution for the Palestinian refugees.(AP Photo/Doug Mills, File)

FILE - In this July 2, 2013, file photo President Barack Obama, right, and former president George W. Bush shake hands with family members of victims of the U.S. Embassy bombing in Tanzania during a wreath laying ceremony at the U.S. Embassy in Dar es Salaam. In the first 200 years of the republic, just three ex-presidents survived more than two decades after leaving office: John Adams, Martin Van Buren and Herbert Hoover. The odds have improved since then: Jimmy Carter, the longest-serving ex-president, has blown past 32 years out of office and shows no signs of stopping at age 88. George H.W. Bush, 89, passed the two-decade mark this year. The two most recent former presidents, Bill Clinton and George W. Bush, both are going strong. (AP Photo/Evan Vucci, File)

FILE - In this April 25, 2013, file photo President Barack Obama, from left, and four former presidents, George W. Bush, Bill Clinton, George H.W. Bush and Jimmy Carter appear together at a dedication ceremony in Dallas, Texas. In the first 200 years of the republic, just three ex-presidents survived more than two decades after leaving office: John Adams, Martin Van Buren and Herbert Hoover. The odds have improved since then: Jimmy Carter, the longest-serving ex-president, has blown past 32 years out of office and shows no signs of stopping at age 88. George H.W. Bush, 89, passed the two-decade mark this year. The two most recent former presidents, Bill Clinton and George W. Bush, both are going strong. (AP Photo/David J. Phillip, File)

FILE - In this April 5, 2013, file photo former President Jimmy Carter gets ready to hit a giant bell during his visit to the famed Shwedagon Pagoda in Yangon, In the first 200 years of the republic, just three ex-presidents survived more than two decades after leaving office: John Adams, Martin Van Buren and Herbert Hoover. The odds have improved since then: Jimmy Carter, the longest-serving ex-president, has blown past 32 years out of office and shows no signs of stopping at age 88. George H.W. Bush, 89, passed the two-decade mark this year. The two most recent former presidents, Bill Clinton and George W. Bush, both are going strong. (AP Photo/Khin Maung Win, File)

FILE - In this April 25, 2013, file photo, former presidents, from left, George W. Bush, Bill Clinton, George H.W. Bush, and Jimmy Carter gather for a ceremony in Dallas, Texas. In the first 200 years of the republic, just three ex-presidents survived more than two decades after leaving office: John Adams, Martin Van Buren and Herbert Hoover. The odds have improved since then: Jimmy Carter, the longest-serving ex-president, has blown past 32 years out of office and shows no signs of stopping at age 88. George H.W. Bush, 89, passed the two-decade mark this year. The two most recent former presidents, Bill Clinton and George W. Bush, both are going strong. (AP Photo/Charles Dharapak, File)

Former President Bill Clinton reacts and hugs House Minority Leader Nancy Pelosi of California as Sen. Barbara Boxer, D-Cailf., watches at left, during the ceremony naming the new Environmental Protection Agency headquarters for President Bill Clinton Wednesday, July 17, 2013, in Washington. (AP Photo/Pablo Martinez Monsivais)

Former President Bill Clinton talks with comer EPA administrator Carol Browner, left, during the ceremony naming the new Environmental Protection Agency headquarters for former President Bill Clinton Wednesday, July 17, 2013, in Washington. (AP Photo/Pablo Martinez Monsivais)

Former President Bill Clinton talks with Sen. Barbara Boxer, D-Calif, during the ceremony naming the new Environmental Protection Agency headquarters in Washington for former President Bill Clinton, Wednesday, July 17, 2013. (AP Photo/Pablo Martinez Monsivais)

Former President Bill Clinton speaks during the ceremony naming the new Environmental Protection Agency headquarters in Washington, after him Wednesday, July 17, 2013. (AP Photo/Pablo Martinez Monsivais)

Former President Bill Clinton speaks during the ceremony naming the new Environmental Protection Agency headquarters in Washington, after him Wednesday, July 17, 2013. (AP Photo/Pablo Martinez Monsivais)

FILE - In this Sept. 30, 2012 file photo, Justin Bieber performs at the MGM Grand Garden Arena in Las Vegas. Bieber has apologized by phone to Bill Clinton for cursing the former president and spraying his photo with cleaning fluid in a New York City restaurant kitchen earlier this year. Clinton's office said Thursday the pop star called and "he apologized and offered to help the Clinton Foundation." Clinton's office declined to provide any other details. (Photo by Isaac Brekken/Invision/AP, File)

Former President Bill Clinton speaks during a meeting of the State Budget Crisis Task Force at the National Constitution Center, Tuesday, June 25, 2013, in Philadelphia. The event is designed to bring attention to the eroding financial condition of state governments. (AP Photo/Matt Rourke)

Michael Kobold, a family friend of actor James Gandolfini, holds a press conference at the Exedra Hotel in Rome, Sunday, June 23, 2013. Kobold told reporters Sunday that the "provisional plan" is to depart Rome on Monday afternoon for the United States, several days earlier than anticipated. Kobold thanked Italian and U.S. authorities, including U.S. Secretary of State John Kerry, his predecessor Hilary Clinton and former President Bill Clinton for helping with arrangements. Gandolfini, 51, died Wednesday in Rome. Kobold has said an autopsy revealed the cause was a heart attack. (AP Photo/Gregorio Borgia)

Michael Kobold, a family friend of actor James Gandolfini, holds a press conference at the Exedra Hotel in Rome, Sunday, June 23, 2013. Kobold told reporters Sunday that the "provisional plan" is to depart Rome on Monday afternoon for the United States, several days earlier than anticipated. He did not specify which U.S. airport. Kobold thanked Italian and U.S. authorities, including U.S. Secretary of State John Kerry, his predecessor Hilary Clinton and former President Bill Clinton for helping with arrangements. Gandolfini, 51, died Wednesday in Rome. Kobold has said an autopsy revealed the cause was a heart attack. (AP Photo/Gregorio Borgia)

Israeli President Shimon Peres sits with former US President Bill Clinton during Peres' 90th birthday gala in Jerusalem, Tuesday June 18 2013. At left is singer Barbra Streisand and at right is Israeli PM Benjamin Netanyahu. (AP Photo/ Jim Hollander, pool)